USING REFERENCE ANGLES TO EVALUATE TRIGONOMETRIC FUNCTIONS

How do you evaluate trigonometric functions in the four quadrants, using reference angles. Watch this video to learn! I am a math educator and through this simple technique, you will learn how easy it is to evaluate say , cosec 1450 or any other value. You will learn the concept of A S T C or “ALL STUDENTS TAKE COFFEE” or any other phrase of your choice.

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TRIGONOMETRIC SUM AND DIFFERENCE OF ANGLES

  Do you want to get over your phobia of trigonometry? This video can help! In this video we will discuss:

1. The sum and difference of trigonometric functions

2. Basic identities and formulas

i. sin(A +B); sin (A-B); cos (A+B); cos (A-B); tan (A+B); tan (A-B)

ii. sin (A+B)sin (A-B) and cos (A+B) .cos (A-B)

iii. how products of the form 2 sin A cos B can be converted into a sum or difference

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DOMAIN AND RANGE OF TRIGONOMETRIC FUNCTIONS

Here, you will learn how to determine the domain and range for the 6 trig functions, sine, cosine, tan, sec, cosec and cot. Simple sketches are drawn for you to understand it graphically.

A very useful topic to understand ,especially, if you need to understand the domain and range of inverse trig functions.

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